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net: kernel BUG at drivers/net/phy/mdio_bus.c:165!

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kernel BUG at drivers/net/phy/mdio_bus.c:165!
Unable to handle kernel NULL pointer dereference at virtual address 00000000

How?

mdiobus_alloc() sets bus->state = MDIOBUS_ALLOCATED.

mdiobus_register() sets bus->state = MDIOBUS_REGISTERED but then can
   fail (mdiobus_scan()) returning an error to the caller.

The caller aborts correctly with mdiobus_free() which does:
        if (bus->state == MDIOBUS_ALLOCATED) {
                kfree(bus);
                return;
        }

        BUG_ON(bus->state != MDIOBUS_UNREGISTERED);

Signed-off-by: Krzysztof Halasa <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Krzysztof Halasa 2008-12-17 00:24:13 -08:00 • committed by David S. Miller
commit e8e5752dc0
1 changed files with 3 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

5
drivers/net/phy/mdio_bus.c
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@ -105,8 +105,6 @@ int mdiobus_register(struct mii_bus *bus)
return -EINVAL;
}
bus->state = MDIOBUS_REGISTERED;
mutex_init(&bus->mdio_lock);
if (bus->reset)
@ -123,6 +121,9 @@ int mdiobus_register(struct mii_bus *bus)
}
}
if (!err)
bus->state = MDIOBUS_REGISTERED;
pr_info("%s: probed\n", bus->name);
return err;